We have a consultant graphics programmer who is doing benchmarks and has a second PC with low specs.
I dug up my 4th old dev PC (i7 860) and have it running now, but it only has 4 GB RAM and an AMD 1 GB VRAM GPU. It will run the game on lower settings, but is very slow for testing as it hits the hard drive a lot (paging) during loading and shutdown and I could not run Unity at the same time. My wife's old PC has 8 GB RAM, which should work in that motherboard, so planning on trying that RAM.
The problem with benchmarks is they tell you where you are at and maybe what is slow, but not how to fix it. Fixing is the hard part.